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The problem I got is if I assign a large number to a float type, for example, float f = 1.0e20 then I print it to the screen with printf("f = %f\n",f), then on the screen it will be f = 100000002004087730000.000000. Could anyone tell me why the number display is not 100000000000000000000.000000. Thanks in advance.
The number you are using has no exact representation in the type you are storing it. As a result, the answers will never be exactly right.
By analogy, consider a computer that used 6 decimal digits. The best you can do for
1/3is.333333But then3 * (1/3) != 1. Oh well.And what about
2/3? If you use.666667then2/3 != 2 * (1/3). If you use.666666then1/3 + 2/3 != 1. Oh well.That’s just the way it is with floating point numbers.